Abstract: The effect of inclusion modification on pitting corrosion of 304 stainless steel with different cerium contents was studied by accelerated immersion test, and electrochemical measurement The results show that in the absence o f cerium, MnS and composite oxide are the dominating inclusions in stainless steel , and the average size reaches 8.6 μm, while the self corrosion potential of steel is only 348.52 mV. By adding the cerium, the incl usions were gradually modified into spherical i nclusions containing cerium, the average size is reduced, and the corrosion resistance of the steel is improved. When the content of cerium reaches 0.012 %, the MnS inclusions are all modified into spherical inclusions containing cerium, and the self corrosion potential of steel reaches 311.25 mV , which has the best corrosion resistance. When the content of cerium increases above 0.012 %, the shape of the inclusions becomes irregular and the size increases, resulting in a decrease in corrosion resistance.
Authors: Xiaojun Xi, Maolin Ye, Shufeng Yang, and Jingshe Li
Keywords: Ce treatment ; 304 stainless steel; MnS inclusion; C orrosion resistance